Photos here:
http://www.meetup.com/Wildcat-Adventure-Club/photos/778189/
Before you get to the end of Rhine Canyon trail (which ends at a park boundary) you can go up the steep side of Diablo adjacent to Rhine Canyon. Multiple rock outcroppings fun to climb and explore before reaching Devil's Pulpit.

Relatively new to climbing with hands. This was a fun place to play around for a bit while visiting diablo and practice scrambling up a fun little rock. The chert is really tactile too, chert is a great rock!

A little girl saw us climbing around and insisted her non-amused daddy climb the rock too.

Looks like there is some more good scrambling underneath it, would be fun to come up from underneath.

I parked at the Devils Elbow and hiked first up to Mt. Diablo's summit then followed the Fire Intepretive Trail around to the Devils Pulpit. After climbing it I found a use trail that cut back down to the Devils Elbow. Loved the lichen encrusted rock formations in the area and the abundant wildflowers and amazing views.